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    <title>Document</title>
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    <!--
    1.ul里面只能放li
    2.默认是黑色的实心圆
    3.type:默认属性值disc，其他属性值circle,square，none(取消前面的点，用的多)
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    <ul type="square">
        <li>打开冰箱</li>
        <li>打开洗衣机</li>
        <li>打开课堂视频</li>
    </ul>
    <ul>
        <li></li>
    </ul>
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